Commit a518b0a5 authored by Vivek Goyal's avatar Vivek Goyal Committed by Paul Moore
Browse files

selinux: Implement dentry_create_files_as() hook 



Calculate what would be the label of newly created file and set that
secid in the passed creds.

Context of the task which is actually creating file is retrieved from
set of creds passed in. (old->security).

Signed-off-by: default avatarVivek Goyal <vgoyal@redhat.com>
Acked-by: default avatarStephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: default avatarPaul Moore <paul@paul-moore.com>
parent 2602625b

security/selinux/hooks.c

+22 −0
Original line number Diff line number Diff line
@@ -2848,6 +2848,27 @@ static int selinux_dentry_init_security(struct dentry *dentry, int mode, 
	return security_sid_to_context(newsid, (char **)ctx, ctxlen);

}



static int selinux_dentry_create_files_as(struct dentry *dentry, int mode,

					  struct qstr *name,

					  const struct cred *old,

					  struct cred *new)

{

	u32 newsid;

	int rc;

	struct task_security_struct *tsec;



	rc = selinux_determine_inode_label(old->security,

					   d_inode(dentry->d_parent), name,

					   inode_mode_to_security_class(mode),

					   &newsid);

	if (rc)

		return rc;



	tsec = new->security;

	tsec->create_sid = newsid;

	return 0;

}



static int selinux_inode_init_security(struct inode *inode, struct inode *dir,

				       const struct qstr *qstr,

				       const char **name,
@@ -6098,6 +6119,7 @@ static struct security_hook_list selinux_hooks[] = { 
	LSM_HOOK_INIT(sb_parse_opts_str, selinux_parse_opts_str),



	LSM_HOOK_INIT(dentry_init_security, selinux_dentry_init_security),

	LSM_HOOK_INIT(dentry_create_files_as, selinux_dentry_create_files_as),



	LSM_HOOK_INIT(inode_alloc_security, selinux_inode_alloc_security),

	LSM_HOOK_INIT(inode_free_security, selinux_inode_free_security),

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